import java.util.ArrayList;
import java.util.List;

public class Demo2 {
    private static int count=0;

    private static Object locker=new Object();
    private static Object locker2=new Object();
    private static String s="hello";
    private static List<String> list=new ArrayList<>();
    public static void main(String[] args) throws InterruptedException{
    Thread t1=new Thread(()-> {
        for (int i = 0; i < 50000; i++) {

            synchronized (s){

            count++;
        }
    }
   });

        Thread t2=new Thread(()->{
            for (int i = 0; i < 50000; i++) {
                synchronized (s) {
                    count++;
                }
            }
        });

        t1.start();
        t2.start();

        t1.join();
        t2.join();
        System.out.println("count="+count);
    }
}
